This version (18 May 2021 09:03) was approved by John Joseph.The Previously approved version (05 Feb 2020 09:50) is available.Diff

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Text-In Eq


The Text-In Eq block gives access to a wide variety of 2nd-order (biquad)filter algorithms.

The available filter types are:

  • Low shelf filter
  • High shelf filter
  • Parametric filter
  • Peaking filter
  • First order low shelf filter
  • First order high shelf filter
  • Low pass filter
  • High pass filter
  • Notch filter
  • Band stop filter
  • Band pass filter
  • All pass filter


To open the filter control window, click on the icon button. Select the desired filter type from the drop-down combo-box list. The filter controls and the icon button image will change to reflect the selected filter type.

Targets Supported

Name ADSP-214xx ADSP-215xx/SC5xx ADAU145x/146x
————————————-- ——————-- ——————————-- —————————-
Text-In Eq B/S B/S S
Text-In Eq Slew NA NA S
Text-In Eq Slew Ext NA NA S



——————————————— —————————— ————————————————
Input0AudioInput Channel 0
Lambda0 (For Slew Ext Only)ControlExternal Slew Input for Stage 0


—————————————— —————————— ————————————————
Output0AudioOutput channel 0

Configurable Parameters

GUI Parameter NameDefault ValueRangeFunction Description
StageX_Boost0 dB -10 to +10 dBSet the boost value for a particular filter curve
StageX_Frequency10000 to 96000HzCut-off frequency
StageX_Gain0 dB-15 to +15 dBFilter Gain
StageX_Q1.410.1 to 16Q factor of the filter
StageX_FilterTypeParametric filterAvailable filter TypesControls the type of the filter
StageX_EnabledOrBypassedTrueTrue/FalseEnabled/Disabled the algorithm
StageX_PhaseFalseTrue/FalseControls the phase of coefficients in 0 degree or 180 degree phase
StageX_Slew (For Slew Variant ADAU145x/146x Only)00 to 1SW slew value for individual filter stages applicable only for Text-in EQ Slew Variant
NumStages11 to 20 Number of stages of filter. Change in this value requires re-compilation
NumChannels1 1 to 20Number of input and output channels. Change in this value requires re-compilation
SlewType (For Slew Variant ADAU145x/146x Only)HWSlewHW/SW SlewSLew type for the filter HW/SW
CustomSlew (For Slew Variant ADAU145x/146x Only)0x208A0x0 to 0xFFFFCustom slew value entered by user

Here, * X - Indicates Stage Number

DSP Parameters

Parameter Name Description ADSP-214xx/SC5xx/215xx ADAU145x/146x
———————————— ————————————————————————————— —————————————- —————————-
StageX_B0B0 Filter CoefficientFloatFixPoint8d24
StageX_B1B1 Filter CoefficientFloatFixPoint8d24
StageX_B2B2 Filter CoefficientFloatFixPoint8d24
StageX_A1A1 Filter CoefficientFloatFixPoint8d24
StageX_A2A2 Filter CoefficientFloatFixPoint8d24
slew_mode Slew value for medium size eq slew variant only NA Integer32
StageX_LambdaExponential decay value of filter stage X for SW slew type onlyNAFixPoint8d24


  • X - Stage Number (Changes for each stage coefficients)

resources/tools-software/sigmastudiov2/modules/filters/textineq.txt · Last modified: 15 May 2021 08:47 by Sreesha Y M